As was written: "Of course, something with an internal arc or hidden arc will
be hard to see using UV camera..".
ONE WONDERS then how effective an ultrasonic micro 'dish' works if the same
principle applies, with hidden arcs and the like?
.
Since I have only used MW/HF DF gear, VHF with an omni antenna and UHF with a
small Yagi to troubleshoot/locate these things I have no hands-on experience
with other gear and must rely on vendors and written evaluation reports and
articles such as I cited..
I include one more article link that may be of
interest..https://www.inmr.com/uv-ir-imaging-of-defects-in-hv-components/
.I note in the literature that corona arcs/arcing (if visible, would be seen
w/UV camera) are what produce the acoustical noise that may be received with
ultrasonic gear, but I have not researched that area like for UV cameras. It
would seem then that acoustical / ultrasonic detection has the same limitation
then that UV cameras have. Discussion?
.de AA5CT Jim
On Friday, February 2, 2024, 3:02:59 PM GMT-6, Michael Martin
<mike@rfiservices.com> wrote:
Close to 99% of overhead Powerline interference noise sources will not be
visible with UV cameras or Corona cameras. Most of what those two cameras see
are not the interference sources affecting your radio system.
Michael Martin
RFI Services
51 W Bay Front Rd
Lothian, MD 20711
240-508-3760
mike@rfiservices.com
www.rfiservices.com
On Fri, Feb 2, 2024, 2:57 PM AA5CT via RFI <rfi@contesting.com> wrote:
We've been here before. Actual arcs exhibit in UV spectrum, and UV sensitive
camera are used by experts in this field to find the arcing hardware. Of
course, something with an internal arc or hidden arc will be hard to see using
UV camera..
Some camera models place the UV corona image upon a visual-light image of the
scene since otherwise no image will be seen on a UV only camera, unlike what is
often seen on an IR camera.
.
From:
.
https://www.inmr.com/infrared-uv-inspection-of-overhead-lines/.
Detecting Corona on Power Lines
.
Infrared (IR) detection technology, while ideal in identifying hot spots in
electrical power systems, has limited value when it comes to detecting corona
activity. Experience shows that only advanced stages of corona can sometimes
become visible using an infrared camera..
The ideal tool to detect corona activity is a solar blind UV camera.
.
An example of what is seen with a UV overlay + visible camera combo.
https://youtu.be/OtvfQ1II_ME?t=32
Also:
.
https://ofilsystems.com/uv-inspection/
de AA5CTJm
On Friday, February 2, 2024, 12:34:43 PM GMT-6, Lee STRAHAN <k7tjr@msn.com>
wrote:
Hi Charlie and all,
John Fluke company has some new equipment that senses IR and I believe they
add ultrasonic for their new remarkable sensor capable of use with power lines.
" https://www.fluke.com/en-us/products/thermal-cameras";
A bit on the spendy side. I remember their new product announcement showing
power line use but do not recall their specific product numbers.
Searching their site.
I Found this. "
https://www.fluke.com/en-us/learn/blog/leak-detection/corona-discharge" ; It's
an ii900 from Fluke
Lee K7TJR OR.
-----Original Message-----
From: RFI <rfi-bounces+k7tjr=msn.com@contesting.com> On Behalf Of Charles Gallo
Sent: Friday, February 2, 2024 7:42 AM
To: Rfi List <rfi@contesting.com>
Subject: Re: [RFI] UPDATE re: Source power pole located - but wonder which
components most likely temperature sensitive
I know HV lines are surveyed with drones in at least some locations. Usually
the company applies for a “beyond visual line of sight” (BVLOS) waver, and they
use drones with thermal imaging and CM accuracy for location
--
73 de KG2V
Charlie
> On Feb 2, 2024, at 10:28 AM, Alan Higbie <alan.higbie@gmail.com> wrote:
>
>
> *I'M CURIOUS*:
>
> - Is there some new technology being used for surveying lines? I sort
> of recall reading something like this. Drones? SDR recording?
> - Or, maybe this is just some guy driving around with his AM radio on?
> - Is there a new version of the ultrasonic dish that is better than the
> previous Radar Engineers model?
> - What is the difference between RE models and the MFJ-5008?
>
> https://mfjen/
> terprises.com%2Fproducts%2Fmfj-5008&data=05%7C02%7C%7C416b4c251bef4ede
> d11108dc24059682%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C63842485
> 3636490497%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzI
> iLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=1y2NbTZ5VnjgayxM9A%
> 2FBNgfhX%2FYWfplde66glt%2BDRhg%3D&reserved=0
>
> I will further update when these tickets are closed out - and the
> defective component is positively identified.
>
> 73, ~ Alan K0AV
> Colorado Springs
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